Air and steam feeding attachment for boiler-furnaces.



PATENTED AUG. 18, 1903 G. MARLOW, Sa. AIR AND STEAM FEEDING ATTACHMENT FOR BOILER FURNACES.

APPLIOATION FILED NOV. 11, 1902.

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UNITED STATES Patented August 18, 190? PATENT OFFICE.

GEORGE MARLOW, SR, OFSPOKANE, WASHINGTON.

SPECIFICATION forming part Of Letters Patent No. 736,857, dated August 18, 1903. Application filerlllovember 1], 1902. Serial No. 130,876. (No model.)

The object of my invention is to prevent es-' cape of smoke and effect a great economy in the combustion of fuel in furnaces.

The invention is embodied in an improved.

apparatus whereby mingled air and steam are introduced into the fire-box of the boiler or other furnace to effect a more perfect combustion, and especially to consume the carbon particles and such gaseous products of com- I bustion as ordinarily escape into the air and are lost. 7

In practice I utilize the heat of exhauststeam for heating air, which is then mingled with exhaust-steam, the mixture being introduced into the firebox.

The apparatus is adapted for application to stationary and marine boiler-furnaces as well as locomotives, and it may be easily and cheaply applied to furnaces already c011- structed.

Details of construction, arrangement, and operationof parts are as hereinafter described, reference being had to the accompanying drawings, (three sheets,) in which Figure 1 is mainly a longitudinal vertical section of a locomotive-boiler and fire-box. Fig. 2 is a view of a water-distributing pipe arranged within the fire-box and forming part of my improved apparatus. Fig. 3 is an enlarged vertical central section of that portion of the apparatus which is connected with or medium of the self-same opening 6'.

0 between the parts l2 and I) through the pipe a, which leads to the front of the smoke-box A, where it is provided with a suitable screen a for excluding dust or other foreign substances. The air which thus enters the annular chamber 0 of the exhaust-nozzle passes thence into the branching or lateral pipes f, by which it is conducted by pipes f into tubes f that lead into a discharge in the fire-box B, as will be further explained. In order that the air may be caused to take a circuitous passage through the heating-chamber c, and thus become more highly heated, I arrange vertical ribs or partitions c in such chamber. (See Figs. and 4.) As there indicated the said partitions extend part way up the exhaust-nozzle, and thus the air is caused to pass up and over them on its way from the pipeAto pipes f. In practice these partitions 0 may be formed of asbestos tightly packed in a suitable holder. The air traversing the chamber 6 does not pass directly into the pipes f, but first into a valve-chamber a. (See Figs. 1, 3, and 4.) The valve is elongated and hollow and adapted to slide horizontally in a casing (a which projects laterally from the exhaust-nozzle b andcommunicates with the jacket I) at e, as indicated in Fig. 3. The valve 6 is also provided with an opening in its lower side, which is in constant communica tion with the annular chamber 0 through the The valve has lateral openings near its front end, which communicate with the pipes f',as shown. It is further provided with an opening in the upper side, which communicates with the pipe 1', (see also Fig. 1,) whose functions will be hereinafter stated.

The valve 6 may be so adjusted as to project into the exhaust-nozzle l), as shown in Fig. 4:,in which case steam may pass from the latter into the valve-chamber at 6 In other words, when the valve is thus adjusted both steam and heated air pass into the valve and are there mingled and escape together into the pipes f, by which and the tubes f the mixture is conducted into the fire-box. It is apparent that the valve may be so adjusted as to hold or partly cut off the inlet of steam from the nozzle 1). Ihis adjustment of the valve is effected by means of a rod j, which in practice will extend into the loco nally in the fire-box B. From such space or chamber 9 the air and steam escape through twyers h and also through apertures h,formed in the upper portion of the fire-arch. (See Figs. 5 and 6.) As is well known, when steam is brought in contact with heated carbon a mixture of hydrogen and carbon monoxid is obtained- In other words, a water-gas is formed which effects instant ignition of the carbon particles, which would otherwise escape in the form of smoke, and also ignites certain gaseous products, so that the heat energy of the fuel is completely utilized, the escape of smoke and cinder effectually prevented, and heat in the fire-box is intensified. A further advantage is obtained in that the suction-draft generally required may be lessened to a considerable extent. the same is at rest, and hence no exhauststeam is available from the cylinders, the necessary supply of steam may be obtained from the exhaust of the air-brake, which is at all times operative. Such exhaust is conducted to the valve 6 by means of the pipe i before mentioned and which is shown in Fig. 1 extending through the side of the boiler, whence in practice it will pass to the brake mechanism. g

The fire-arch g is preferably made of fireclay, as are also the sleeves g which connect the same with the tubes f It will be understood that the distributing space or chamber g extends practically the entire width of the fire-box B and that the twyers h will be of such size and number and provided with such perforations as will amply provide for due escape of steam and air therefrom.

The apparatus thus far described promotes combustion in the upper portion of the firebox. To effect the same result in the lower and front portion of said fire-box, I provide the fire-door (1 (see Figs 1 and 6) with perforations through which air is admitted, and surrounding such door on the inner side is a pipe 0, which is supported by a pipe 0, that connects with a flexible pipe 0 leading to the water-cistern (not shown) of the locomotive. The oval pipe 0 is provided with minute perforations in its inner side for passage of water, the same escaping in drops, which are quickly converted in to steam that mingles with the air admitted through the fire-door q and forms a water-gas, whereby intense combustion is pro- The lower' In the case of a locomotive when duced in the front portion of the fire-box B and beneath the circulating-tubes m. The doorq is provided on the inner side with a baflie-plate q, whose edges are spaced from the door-jamb r. The air is heated in passing through this space and forms with the steam and carbon in the fire-box a water-gas which unites with the gas arising from the cokingcoal at :r and thus produces perfect combustion. In practice the coal at is dumped close to the door q in order that it may be coked where its gases will unite with the water-gas, as stated. I employ a peculiarly-constructed coal carrier or cart for discharging coal at the point 00, and the same is adapted to prevent the inlet of a large volume of cold air when the door q is opened.

As shown in Fig. 3, an asbestos packing is provided between the jacket I) and the exhaust-nozzle b for the purpose of closing the top of the annular air-heating chamber 0. Such packing Zis confined by a conical flange Z and a collar Z What I claim is 1. The combination, with a boiler, fire-box, and steam-exhaust nozzle, of an air-conducting pipe leading to the front of the boiler, a jacket surrounding the exhaust-nozzle and arranged to provide an air-heating chamber between them, a valve-casing, and partitions arranged in connection with the jacket and nozzle as described, a hollow valve adapted to slide in the casing and to take air and steam from the said chamber and nozzle respectively, means foradjusting the said valve, pipes connecting with the valve-casing and extending into the fire-box, and a distributing-chamber arranged in the latter and provided with discharge-openings, substantially as shown and described.

2. In an air and steam feeding attachment, the combination, with the exhaust-nozzle and a jacket therefor forming an air-heating chamber as described, of a valve attachment comprising a lateral casing which com-municates with both said nozzle and chamber, and devices leading to the fire-box, ahollow valve having bottom and lateral openings whereby it is adapted to communicate with the nozzle, the air-chamber, and the aforesaid pipes, and means for adjusting said valve for regulating the admission and discharge of air and exhaust-steam, substantially as shown and described.

3. In an air and steam feed attachment, the combination, with a steam-conducting pipe and an air-heating chamber adjacent thereto, of a hollow slidable valve and a valve-casing therefor which extends through the side walls of the aforesaid pipe and chamber and is provided with an opening which communicates with the chamber, the valve having an opening in its lower side which, when the valve is properly adjusted, communicates with both the pipe and chamber, and also provided with a discharge-opening near its outer end, means for adjusting the said valve, and pipes for III;

conducting mingled air and steam from the plemental steam pipe connected with the Valve-casing and extending tothe brake mech- 1 o anism, and means foroperating the said valve, substantially as shown and described.

GEORGE MARLOW, SR. \Vitnesses:

W. P. GILBERT, WALTER G. MERRYWEATHER. 

